Add variable to set direct routing on flannel VXLAN (#9438)

inventory/sample/group_vars/k8s_cluster/k8s-net-flannel.yml

@@ -16,3 +16,4 @@
 # flannel_backend_type: "vxlan"
 # flannel_vxlan_vni: 1
 # flannel_vxlan_port: 8472
+# flannel_vxlan_direct_routing: false

roles/network_plugin/flannel/defaults/main.yml

@@ -19,6 +19,7 @@
 flannel_backend_type: "vxlan"
 flannel_vxlan_vni: 1
 flannel_vxlan_port: 8472
+flannel_vxlan_direct_routing: false
 
 # Limits for apps
 flannel_memory_limit: 500M

roles/network_plugin/flannel/templates/cni-flannel.yml.j2

@@ -34,7 +34,8 @@ data:
       "Backend": {
         "Type": "{{ flannel_backend_type }}"{% if flannel_backend_type == "vxlan" %},
         "VNI": {{ flannel_vxlan_vni }},
-        "Port": {{ flannel_vxlan_port }}
+        "Port": {{ flannel_vxlan_port }},
+        "DirectRouting": {{ flannel_vxlan_direct_routing | to_json }}
 {% endif %}
       }
     }